HomeMy WebLinkAboutSLOUNIFLOW_FS1 Admin iRC3926i Color_0028_001June 9, 1997
Mr. Scott Small
Chevron Products Company, Inc.
1300 South Beach Blvd.
LaHabra,CA 90632-2833
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Pete Wilson
Couennr
Central Coast
Regional Water
Quality Control
Board
8l Higuera Street
Suite 200
San Luis Obispo, CA
93401-542',7
(9os) 549-3147
FAX (80s) s43-0397
Dear Mr. Small
UGT. I51 SANTA ROSA STREET, SAN LUIS OBISPO, CHEVRON STATION 9-1717;
GROUND WATER MONITORING
We have reviewed you April 9, 1997 letter, the City of San Luis Obispo Fire Department's
February 14, 1996letter, Secor's January ll,1996 "Results of Site Assessment and Corrective
Action Plan" and February 2, 1996 "Soil Excavation Report." Based on these documents, it
appears ground water has been contaminated due to leaks from Chevron's underground fuel
storage tanks located at the above-cited properfy.
The last sampling of ground water at this site was done on December 8, 1995. The analytical
results from this sampling event include benzene at 150 pgll. No other analytes were detected at
concentrations above this Board's Water Quality Control Plan's Water Quality Objectives
(WQO) for use of ground water as a municipal or domestic supply. The WQO for benzene is one
$s^.
Given the above discussion, it seems prudent to collect and analyze at least two groundwater
samples from all site monitoring wells prior to taking any extensive action (e.g., plume
delineation) at this site. Therefore; pursuant to Section 13267 of the California Water Code,
Chevron is direction to conduct two ground water sampling events described as follows:
During September 1997 and March 1998 all wells shall be measured for water level; properly
purged (based on a comparison of the final two casing volumes meeting the following criteria:
temperature @ +1.0 oF, pH @ *0) pH units and specific conductance q +fi%); and, after
purging, ground water samples collected. Ground water samples shall be analyzed for the
parameters listed below:
Our mission is to preserve and enhance the quality ofCalifornia's water resources, and
ensure their proper allocation and etficient usefor the beneft ofpresent andfuture generalions.
COI{STITUENT UNITS SA1VIPI,E
TYPE
EPA TEST
METHOD
PRACTICE
QUAr[TTTATTVE
LIMIT
Water Elevation Feet Measured Not Applicable Not Applicable
Benzene Micrograms/Liter Grab 8020 0.5
Ethylbenzene Micrograms/Liter Grab 8020 0.5
Toluene Micrograms/Liter Grab 8020 0.5
Xylene Micrograms/Liter Grab 8020 0.5
MTBE Microgramslliter Grab 8020 0.5
Total Petroleum
Hydrocarbon
Microgramslliter Grab 8015
Calif Modified
500
t6 *",r,,,d Paper
,.--.t
,
Mr. Scott Small -2-June 9, 1997
Monitoring reports shall be submitted by the 20th day of October 1997 and April 1998 and
include the following:
o a map showing locations of all site monitoring wells, ground water contours and direction of
ground water flow;
. a summary of allcurrent and previous ground water monitoring data in tabular form;
a all certified laboratory analytical reports for current data;
. an evaluation and interpretation of all available data;
o all well logs for ground water monitoring wells associated with this site; and,
. sampling protocols and field sampling logs.
Please note. Section 12368 of the Water Code provides for civil liabilities of up to $1,000 per
day for each day a compliance date issued under Section 13267 is violated.
If you have any questions, please call Frank J. DeMarco at (805) 542-4638.
Sincerely,
Briggs
Officer
FJD:sg
cc:
J*.. ,o"n"er Meyer
San Luis Obispo City Fire Department
2160 Santa Barbara Ave.
San Luis Obispo, CA 93401-5240
Ms. Judy Reid
State Water Resources Control Board
UGT Cleanup Fund
P. O. Box 944212
Sacramento, CA 94244-2120
FJD\S :\FRANK\chev6-7.doc
Task: 305-08
Our mission is to preseme and enhance the quality of California's waler resources, and
ensure their proper allocation and elfiqient usetor the beneft ofpresent andfuture generations{pn"v"t"d Paper